We stayed for 8 nights at 49 Plus and had a great time. It is spacious enough for a family of four to spread out, it is very quiet, and it is located in a great part of Bangkok - surrounded by great Japanese restaurants and some really good coffee providors ('Roast' and 'Pacamara').
Our favourite part of our stay was the rooftop pool and gym which has awesome city sunset views. We spent a couple of hours unwinding, swimming, jogging and reading in the rooftop every day after sightseeing. We seemed to be the only people using the rooftop so it was like our own private resort!
Anshera was very friendly, organised and easy to communicate with.